Bars that become shafts cannot afford hidden curvature, and this video shows an automatic bar straightening machine preparing precision bar stock. Each bar is measured while supported between centers or on rests, the CNC maps runout along the length, and the press ram applies measured correction at the flagged points — with results displayed before the bar leaves the machine.
The equipment handles bar from Ø5–600 mm and 100 mm to 12 m, in automatic cycles of 20–90 seconds. Measurement density follows the part: 2–3 points for short shafts, 5+ for long bars and up to 5–8 probes on long beds. Precision work achieves 0.02–0.05 mm TIR, with the most demanding bars held to ≤0.02 mm.
Machining shops, motor and pump manufacturers, linear motion builders and transmission makers straighten piston rods, motor shafts, lead screws and spindle blanks on this machine, protecting tight machining allowances and reducing chucking problems. The screen capture in the video shows runout values falling with each pass, making it easy to see why operators trust the machine to release bars straight the first time rather than reworking them later.
See how runout targets are defined and measured in our TIR and straightness explainer, review the Bar & Tube Straightening Machine selection, or request sample testing on your bar stock.
Runout mapped along the full bar before correction
2–3 points for short shafts, 5–8 probes on long beds
Runout down to 0.02–0.05 mm, ≤0.02 mm for precision parts
20–90 second automatic cycles across Ø5–600 mm
Protects machining allowances on shafts and spindle blanks
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